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Detiding ADCP data in a highly variable shelf sea

Carrillo, L.; Souza, A.J.; Hill, A.E.; Brown, J.; Ferdinand, L.; Candela, J.. 2005 Detiding ADCP data in a highly variable shelf sea. Journal of Atmospheric and Oceanic Technology, 22 (1). 84-97. 10.1175/JTECH-1687.1

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Abstract/Summary

This paper presents a comparison of two conventional detiding techniques carried out for ship-mounted acoustic Doppler current profiler (ADCP) data collected in the European shelf area of the Celtic Sea during the summer of 1998. One technique consisted of extracting the vertically averaged tidal currents obtained from a barotropic three-dimensional numerical tidal model. The second technique consisted of fitting the spatiotemporal ADCP data using least squares and polynomial spatial functions. In the least squares technique, the incorporation of zero velocity normal to the coast appears to improve the estimation of the tidal currents near the coast. Quantitative comparisons of the results from both techniques with historical current meter observations are shown. However, both methods showed limitations in accurately representing the tidal currents in the study area. Consequently, an alternative detiding technique is proposed. This technique consists of blending the tidal currents derived from the numerical model with those fitted to the ADCP data from the least squares method. Improved results were obtained using the blending technique. ADCP-derived residual currents were comparable with contemporaneous flows measured using drifting buoys and also with estimates obtained by geostrophic calculations.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1175/JTECH-1687.1
Programmes: POL Programmes > Modelling and observation systems for shelf seas > Total system science integrating model and measurement
POL Programmes
ISSN: 0739-0572
Additional Keywords: Tidal Analysis ADCP Residual Circulation
NORA Subject Terms: Marine Sciences
Date made live: 18 Jul 2013 12:42 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/502670

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